Will Falconer, DVM Moderator
While a half dose of a vaccine may reduce the toxic load, I think it will not moderate the bigger risk of vaccinosis one iota.
If you can find someone about to vaccinate for rabies and commingle right afterwards, odds are your problems will be over.
The frequency of titer testing should have no bearing on the outcome: he'll either convert (make a titer) or he won't, after an exposure. One test 3-4 weeks out should tell the story yea or nay.